Asahi Kasei

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    ASAHI KASEI [AK4522]

    M0020-E-01 1998/10- 1 -

    GENERAL DESCRIPTIONThe AK4522 has a dynamic range of 100dB and is well-suited middle-range MD, surround system,musical instruments and car audio. Signal inputs and outputs are single-ended. The DAC outputs areanalog filtered to remove out of band noise. External components are minimized. The AK4522 is availablein a small 24pin VSOP package, which will reduce system space.

    FEATURES Stereo ADC

    - 64x Oversampling- Sampling Rate Ranging from 16kHz to 48kHz- S/(N+D): 92dB- Dynamic Range, S/N: 100dB- Digital HPF for offset cancellation

    Stereo DAC- 128x Oversampling- Sampling Rate Ranging from 16kHz to 48kHz- 2nd order SCF + 2nd order CTF- Digital de-emphasis for 32kHz, 44.1kHz, 48kHz sampling- S/(N+D): 90dB- Dynamic Range, S/N: 100dB- Soft Mute

    High Jitter Tolerance Master Clock: 256fs, 384fs, 512fs Analog Power Supply: 4.5 to 5.5V, Digital Power Supply: 2.7 to 5.5V Small VSOP Package: 24pin VSOP

    VA AGND VD DGND CMODE

    AINL+

    AINL-

    AINR+

    AINR-

    VREFH

    VCOM

    AOUTL

    AOUTR

    MCKI

    LRCK

    SCLK

    SDTO

    SDTI

    DIF0DIF1

    SMUTE

    DEM1DEM0PD

    Modulator

    Modulator

    FilterDecimation

    FilterDecimation

    HPF

    HPF

    Common Voltage

    LPF

    LPF

    Modulator

    Modulator

    Interpolator8x

    Interpolator8x

    Serial I/OInterface

    ClockDivider

    20Bit Stereo ADC & DACAK4522

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    ASAHI KASEI [AK4522]

    M0020-E-01 1998/10- 2 -

    n Ordering Guide

    AK4522VF -10 +70 C 24pin VSOP (0.65mm pitch)AKD4522 Evaluation Board for AK4522

    n Pin Layout

    6

    5

    4

    3

    2

    1VREFH

    AINR+

    AINL+

    AINR-

    AINL-

    VA

    AGND 7

    DIF0 8

    VCOM

    AOUTR

    AOUTL

    CMODE

    PD

    DGND

    VD

    MCKI

    TopView

    10

    9DIF1

    LRCK

    SCLK 11

    SDTI 12

    DEM1

    DEM0

    SMUTE

    SDTO

    19

    20

    21

    22

    23

    24

    18

    17

    15

    16

    14

    13

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    ASAHI KASEI [AK4522]

    M0020-E-01 1998/10- 3 -

    PIN/FUNCTION

    No. Pin Name I/O Function

    1 VREFH IPositive Voltage Reference Input Pin, VA

    Used as a positive voltage reference by ADC & DAC. VREFH should be connectedexternally to filtered VA.

    2 AINR+ I Rch Analog Positive Input Pin3 AINR- I Rch Analog Negative Input Pin4 AINL+ I Lch Analog Positive Input Pin5 AINL- I Lch Analog Negative Input Pin6 VA - Analog Power Supply Pin7 AGND - Analog Ground Pin8 DIF0 I Audio Data Interface Format Pin9 DIF1 I Audio Data Interface Format Pin

    10 LRCK I Input/Output Channel Clock Pin11 SCLK I Audio Serial Data Clock Pin12 SDTI I Audio Serial Data Input Pin

    13 SDTO O Audio Serial Data Output Pin

    14 SMUTE ISoft Mute Pin

    When this pin goes H, soft mute cycle is initiated.When returning L, the output mute releases.

    15 DEM0 I De-emphasis Frequency Select Pin16 DEM1 I De-emphasis Frequency Select Pin17 MCKI I Master Clock Input/Xtal Input Pin18 VD - Digital Power Supply Pin19 DGND - Digital Ground Pin20 PD I Reset Pin

    21 CMODE IMaster Clock Select Pin (Internal Biased pin)

    H: 384fs, L: 256fs, NC: 512fs22 AOUTL I Lch Analog Output Pin23 AOUTR I Rch Analog Output Pin24 VCOM O Common Voltage Output Pin, VA/2

    Note: All input pins except pull-down pins should not be left floating.

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    ASAHI KASEI [AK4522]

    M0020-E-01 1998/10- 4 -

    ABSOLUTE MAXIMUM RATINGS(AGND DGND=0V; Note 1)Parameter Symbol min max UnitsPower Supplies Analog

    Digital|AGND-DGND| (Note 2)

    VAVD

    GND

    -0.3-0.3

    -

    6.06.00.3

    VVV

    Input Current, Any Pin Except Supplies IIN -

    10 mAAnalog Input Voltage VINA -0.3 VA+0.3 VDigital Input Voltage VIND -0.3 VD+0.3 VAmbient Temperature (power applied) Ta -10 70 CStorage Temperature Tstg -65 150 C

    Note:1. All voltages with respect to ground.2. AGND and DGND must be same voltage.

    WARNING: Operation at or beyond these limits may result in permanent damage to the device.Normal operation is not guaranteed at these extremes.

    RECOMMENDED OPERATING CONDITIONS(AGND, DGND=0V; Note 1)Parameter Symbol min typ max UnitsPower Supplies

    (Note 3)AnalogDigital

    VAVD

    4.52.7

    5.05.0

    5.5VA

    VV

    Note:1. All voltages with respect to ground.3. The power up sequence between VA and VD is not critical.

    *AKM assumes no responsibility for the usage beyond the conditions in this datasheet.

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    ASAHI KASEI [AK4522]

    M0020-E-01 1998/10- 5 -

    ANALOG CHARACTERISTICS(Ta=25 C; VA, VD=5V; AGND, DGND=0V; VREFH=VA; fs=44.1kHz; SCLK=64fs;

    Signal Frequency =1kHz; 20bit Data; Measurement Frequency=10Hz 20kHz; unless otherwise specified)

    Parameter min typ max Units

    ADC Analog Input Characteristics: Differential Inputs; Analog Source Impedance=470

    Resolution 20 BitsS/(N+D) (-0.5dB Input) (Note 4) 84 92 dBDR (-60dB Input, A-Weighted) (Note 5) 94 100 dBS/N (A-Weighted) (Note 5, 6) 94 100 dBInterchannel Isolation 90 110 dBInterchannel Gain Mismatch 0.1 0.3 dBGain Drift 20 ppm/ CInput Voltage (AIN=0.6 x VREFH) (Note 7) 2.85 3.0 3.15 VppInput Resistance 20 30 k

    Power Supply Rejection (Note 8) 50 dB

    DAC Analog Output Characteristics:

    Resolution 20 BitsS/(N+D) 80 90 dBDR (-60dB Output, A-Weighted) (Note 5) 95 100 dBS/N (A-Weighted) (Note 6, 9) 95 100 dBInterchannel Isolation 90 110 dBInterchannel Gain Mismatch 0.2 0.5 dBGain Drift 20 ppm/ COutput Voltage (AOUT=0.6 x VREFH) 2.65 2.9 3.15 VppLoad Resistance 5 k

    Load Capacitance 25 pFPower Supply Rejection (Note 8) 50 dB

    Power Supplies

    Power Supply Current (VA=VD=5V)Analog, VA PD =H 42 55 mADigital, VD PD =H 10 20 mA

    Note: 4. In case of single ended input, S/(N+D)=80dB(typ, @VA=5V).5. In case of 16bit, DR and S/N of ADC are 98dB. DR of DAC is 98dB.6. S/N measured by CCIR-ARM is 96dB at each converter and 94dB at ADC to DAC loopback.7. Full scale input for each AIN+/- pin is 1.5Vpp in differential mode.8. PSR is applied to VA, VD with 1kHz, 50mVpp. VREFH pin is held a constant voltage.9. As the input data is 0, S/N is 100dB regardless of resolution.

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    ASAHI KASEI [AK4522]

    M0020-E-01 1998/10- 6 -

    FILTER CHARACTERISTICS(Ta=25 C; VA=4.5 5.5V, VD=2.7 5.5V; fs=44.1kHz; DEM0=1, DEM1=0)Parameter Symbol min typ max UnitsADC Digital Filter (Decimation LPF):Passband (Note 10) -0.005dB

    -0.02dB

    -0.06dB-6.0dB

    PB 00

    00

    19.7620.02

    20.2022.05

    kHzkHz

    kHzkHzStopband SB 24.34 kHzPassband Ripple PR 0.005 dBStopband Attenuation SA 80 dBGroup Delay (Note 11) GD 29.3 1/fsGroup Delay Distortion GD 0 usADC Digital Filter (HPF):Frequency Response (Note 10) -3dB

    -0.5dB-0.1dB

    FR 0.92.76.0

    HzHzHz

    DAC Digital Filter:Passband (Note 10) -0.06dB

    -6.0dB

    PB 0

    0

    20.0

    22.05

    kHz

    kHzStopband SB 24.1 kHzPassband Ripple PR 0.06 dBStopband Attenuation SA 43 dBGroup Delay (Note 11) GD 14.7 1/fsDAC Digital Filter + Analog Filter:Frequency Response: 0 20.0kHz FR 0.2 dB

    Note:10. The passband and stopband frequencies scale with fs.For example, 20.02kHz at -0.02dB is 0.454 x fs. The reference frequency of these responses is 1kHz.

    11. The calculating delay time which occurred by digital filtering. This time is from the input of analog signal tosetting the 20bit data of both channels to the output register for ADC.For DAC, this time is from setting the 20bit data of both channels on input register to the output of analog

    signal.

    DIGITAL CHARACTERISTICS(Ta=25 C; VA=4.5 5.5V, VD=2.7 5.5V)Parameter Symbol min typ Max UnitsHigh-Level Input Voltage (Except CMODEpin)Low-Level Input Voltage (Except CMODEpin)

    VIHVIL

    70%VD-

    --

    -30%VD

    VV

    High-Level Input Voltage (CMODE pin)Low-Level Input Voltage (CMODE pin)

    VIHVIL

    95%VD-

    --

    -10%VD

    VV

    Hight-Level Output Voltage (Iout=-80uA)Low-Level Output Voltage (Iout=80uA)

    VOHVOL

    VD-0.4-

    --

    -0.4

    VV

    Input Leakage Current (Note 12) Iin - - 10 uA

    Note: 12. CMODE pin has internal pull-up and pull-down devices, nominally 50kohm.

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    ASAHI KASEI [AK4522]

    M0020-E-01 1998/10- 7 -

    SWITCHING CHARACTERISTICS(Ta=25 C; VA=4.5 5.5V, VD=2.7 5.5V; C L=20pF)Parameter Symbol min typ max Units

    Master Clock TimingExternal Clock 256fs:

    Pulse Width LowPulse Width High

    384fs:Pulse Width LowPulse Width High

    512fs:Pulse Width LowPulse Width High

    fCLKtCLKLtCLKHfCLK

    tCLKLtCLKHfCLK

    tCLKLtCLKH

    4.0962727

    6.1442020

    8.1921515

    12.288

    18.432

    24.576

    MHznsns

    MHznsns

    MHznsns

    LRCKFrequencyDuty Cycle

    fsndfs

    1645

    44.1 4855

    kHz%

    Serial Interface Timing

    Slave modeSCLK PeriodSCLK Pulse Width Low

    Pulse Width HighLRCK Edge to SCLK (Note 13)SCLK to LRCK Edge (Note 13)LRCK to SDTO(MSB)SCLK to SDTOSDTI Hold TimeSDTI Setup Time

    tSCKtSCKLtSCKHtLRStSLRtLRMtSSDtSDHtSDS

    16065654545

    4025

    4050

    nsnsnsnsnsnsnsnsns

    Reset TimingPD Pulse Width

    PD to SDTO valid (Note 14)

    tPD

    tPDV

    150

    516

    ns

    1/fs

    Note 13. SC